CN111194133B

CN111194133B - Device for generating neutral dust particle flow by using ultraviolet radiation and electron gun

Info

Publication number: CN111194133B
Application number: CN202010031522.3A
Authority: CN
Inventors: 李海龙; 陆欢欢; 王茂琰; 蒙林; 王彬; 殷勇; 朱逸政
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2022-01-11
Anticipated expiration: 2040-01-13
Also published as: CN111194133A

Abstract

The invention discloses a device for generating neutral dust particle flow by utilizing ultraviolet radiation and an electron gun, which relates to the technical field of dust particle accelerator equipment, and comprises an ionization cavity, an acceleration cavity, an electron gun neutralization channel and a deflection cavity which are sequentially communicated end to end, wherein the ionization cavity, the acceleration cavity, the electron gun neutralization channel and the deflection cavity are all horizontally arranged cylinders with openings at two ends; be equipped with ionization subassembly and radiation module in the ionization chamber, the chamber is equipped with higher speed the subassembly with higher speed, the side intercommunication of electron gun neutralization channel is provided with the electron gun body, it is equipped with the subassembly that deflects to deflect the chamber lateral wall, the tail end in chamber with higher speed with between the head end of electron gun neutralization channel the tail end of electron gun neutralization channel with be equipped with the insulating ring between the head end in chamber with deflect respectively, have potential advantage simple to use, with low costs, safe in operation.

Description

Device for generating neutral dust particle flow by using ultraviolet radiation and electron gun

Technical Field

The invention belongs to the technical field of dust particle accelerator equipment, and particularly relates to a device for generating a neutral dust particle flow by utilizing ultraviolet radiation and an electron gun.

Background

The space debris refers to waste and derivatives thereof generated in space activities of human beings, and mainly comprises waste spacecrafts, rocket tail stages, discards in the task execution process, rocket explosives, fragments generated by the disintegration of space aircrafts and the mutual collision of the fragments and the like. Space debris is a main pollution source of space environment, the increasing space debris on the orbit can affect and threaten the sustainable utilization of space resources by human beings, and the space debris removal is an important problem which must be faced by future space missions.

The main technical means for removing the space debris at home and abroad comprises 3 types of pushing off the rail, increasing resistance and catching off the rail. The energy beams such as laser, ion beams, solar radiation and the like are utilized to act on the space debris to generate specific force action so as to enable the space debris to leave the original orbit, and the purpose of removing is achieved. The resistance-increasing off-track reduces the height of the fragment track by increasing the flight resistance of the fragments, thereby shortening the service life of the fragment track and enabling the fragment track to be off-track and enter the atmosphere within the specified time. Catch removal debris is removed by direct physical contact of the mission aircraft with the space debris. The ion beam pushing and off-track technology is a novel non-contact space debris clearing mode, is suitable for remote operation, does not need a meeting process and a complex control system, and is suitable for space debris with different tracks and sizes. Compared with the technology of laser and the like for realizing off-orbit through material melting, the momentum transfer efficiency of the ion beam pushing off-orbit mode is much higher by using the same energy cost. At present, the European Bureau, Japan and Russia all propose similar concepts.

In the method for moving space debris away from the rail by the ion beam, one of the key technologies is to generate and release a large amount of stable ion beams, and the technology has the defects that the ejected ion beams are dispersed freely and have poor controllability; low efficiency, long off-track time and high cost for realization.

Disclosure of Invention

The invention aims to: aiming at the problems of free dispersion, poor controllability, low efficiency, long off-track time and high cost of the ion beam ejected by the dust particle accelerator in the prior art, the device for generating neutral dust particle flow by utilizing ultraviolet radiation and an electron gun is provided.

The technical scheme adopted by the invention is as follows:

a device for generating neutral dust particle flow by utilizing ultraviolet radiation and an electron gun comprises an ionization chamber, an acceleration chamber, an electron gun neutralization channel and a deflection chamber which are sequentially communicated end to end, wherein the ionization chamber, the acceleration chamber, the electron gun neutralization channel and the deflection chamber are all in a flat cylindrical shape with two open ends;

the ionization chamber is internally provided with an ionization assembly and a radiation assembly, the acceleration chamber is provided with an acceleration assembly, the side edge of the electron gun neutralization channel is communicated with an electron gun body, the outer side wall of the deflection chamber is provided with a deflection assembly, the tail end of the acceleration chamber is communicated with the head end of the electron gun neutralization channel, the tail end of the electron gun neutralization channel is communicated with the head end of the deflection chamber, and insulation rings are respectively arranged between the tail end of the electron gun neutralization channel and the head end of the deflection chamber.

Preferably, the ionization assembly comprises a mesh-shaped discharge electrode concentrically arranged in the ionization chamber, a plurality of first insulating columns which connect the outer side surface of the mesh-shaped discharge electrode and the inner wall of the ionization chamber are sequentially arranged between the outer side surface of the mesh-shaped discharge electrode and the inner wall of the ionization chamber, a dust container which can release dust in a controlled manner is arranged at the upper part of a space surrounded by the mesh-shaped discharge electrode, and an observation window is arranged at a head port of the ionization chamber.

Preferably, the dust container is in a vertically-arranged cylindrical shape, the bottom surface of the dust container is in a mesh structure, and the top or the side wall of the dust container is provided with a vibration mechanism which can be controlled to open and close.

Preferably, the observation window is fixed at the position of the head port of the ionization chamber through a detachable fastening knob, and a sealing gasket is arranged between the observation window and the head port of the ionization chamber.

Preferably, the vacuum system comprises a gas tank, the output end of the gas tank is communicated with a gas inlet hole formed in the side wall of the ionization chamber through a gas inlet pipeline, and a control valve is arranged on the gas inlet pipeline; the vacuum system further comprises a vacuum pump, the input end of the vacuum pump is communicated with an air outlet hole formed in the side wall of the ionization cavity through an air outlet pipeline, and a control valve is arranged on the air outlet pipeline.

Preferably, the accelerating component comprises a mesh negative electrode arranged between the head port of the accelerating cavity and the tail port of the ionization cavity and a mesh positive electrode arranged between the tail port of the accelerating cavity and the head port of the electron gun and channel, and a magnetic focusing coil is concentrically arranged on the outer side wall of the accelerating cavity; the magnetic focusing coil is connected with the accelerating cavity through a plurality of second insulating columns which are distributed on the outer side wall of the accelerating cavity in sequence, and a constant magnetic field is formed in the accelerating cavity.

Preferably, the deflection assembly comprises a deflection electrode concentrically arranged on the outer side wall of the deflection cavity, the deflection electrode is connected with the deflection cavity through a plurality of fourth insulating columns distributed on the outer side wall of the deflection cavity in order, and a deflection electric field is formed in the deflection cavity.

Preferably, the power system comprises an alternating current power supply, a light control power supply, a negative monopulse power supply and a direct current power supply, wherein one end of the alternating current power supply penetrates through a first channel formed in the side wall of the ionization cavity and is electrically connected with the reticular discharge electrode, and the other end of the alternating current power supply is electrically connected with the resonant inductor and the outer side wall of the ionization cavity; two ends of the light control power supply respectively penetrate through a second channel formed in the side wall of the ionization chamber and are electrically connected with the ultraviolet deuterium lamp, and the ultraviolet deuterium lamp is connected with the inner wall of the ionization chamber through a fifth insulating column; the negative single-pulse power supply is electrically connected with the negative electrode through a third channel; and the direct current power supply is electrically connected with the outer side wall of the deflection cavity.

Preferably, the electron gun neutralization channel and the acceleration chamber have inner diameters smaller than the inner diameter of the ionization chamber.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the technical scheme of the invention can obtain neutral dust particle flow capable of being applied in vacuum with low consumption and high efficiency by arranging the radiation cavity and the electron gun, the device can achieve the function of tracking and removing space debris for a long time by cooperating with a satellite, and the device can control the size and the type of dust particles, is suitable for dealing with space debris with different sizes, and has great popularization value and wide application prospect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a front cut-away view of the overall construction of the present invention;

FIG. 2 is a schematic cross-sectional view of an ionization chamber of the present invention;

FIG. 3 is a schematic cross-sectional view of an acceleration chamber of the present invention;

FIG. 4 is a schematic cross-sectional view of a neutralization channel of the electron gun of the present invention;

FIG. 5 is a schematic cross-sectional view of a deflection chamber of the present invention

The labels in the figure are: 1-ionization chamber, 2-acceleration chamber, 3-electron gun neutralization channel, 4-deflection chamber, 101-air inlet, 102-air outlet, 103-discharge electrode, 104-first channel, 105-first insulating column, 106-dust container, 107-sealing gasket, 108-observation window, 109-fastening knob, 110-second channel, 111-ultraviolet deuterium lamp, 112-fifth insulating column, 201-positive electrode, 202-third channel, 203-second insulating column, 204-magnetic focusing coil, 205-negative electrode, 301-electron gun body, 302-insulating ring, 401-deflection electrode, 402-fourth insulating column, 501-control valve, 502-air tank, 503-vacuum gauge, 504-vacuum pump, 601-alternating current power supply, 602-resonant inductor, 603-light control power supply, 604-negative monopulse power supply, 605-direct current power supply.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: reference numerals and letters in the specification denote similar items in the following drawings, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in the following drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when in use, and are simply used for simplifying the description of the present invention, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two original pieces can be directly connected or indirectly connected through an intermediate medium, or the two original pieces can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A device for generating a stream of neutral airborne particles using ultraviolet radiation and an electron gun, characterized by: the device comprises an ionization chamber, an acceleration chamber 2, an electron gun neutralization channel 3 and a deflection chamber 4 which are sequentially communicated end to end, wherein the ionization chamber 1, the acceleration chamber 2, the electron gun neutralization channel 3 and the deflection chamber 4 are all in a flat cylindrical shape with two open ends, the device also comprises a vacuum system communicated with a pipeline of the ionization chamber 1 and an electric power system for providing electric energy for the ionization chamber 1, the acceleration chamber 2, the electron gun neutralization channel 3 and the deflection chamber 4; be equipped with ionization subassembly and radiation module in the ionization chamber 1, chamber 2 is equipped with the subassembly with higher speed, the side intercommunication of electron gun neutralization channel 3 is provided with

electron gun body

301, 4 lateral walls in chamber of deflecting are equipped with the subassembly that deflects, the tail end in chamber 2 with higher speed with between the head end of electron gun neutralization channel 3 the tail end of electron gun neutralization channel 3 with be equipped with the insulating ring between the head end of chamber 4 that deflects respectively.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

The preferred embodiment of the present invention provides a device for generating a neutral dust particle flow by using ultraviolet radiation and an electron gun, wherein: the ionization chamber 1 is cylindrical, a hollow circular reticular discharge electrode 103 is arranged in the chamber, the outer diameter of the discharge electrode 103 is smaller than the inner diameter of the ionization chamber, and the discharge electrode is connected with the ionization chamber through a first insulating column 105 to form a concentric structure; the observation window 108 is fixed on one side of the ionization chamber 1 through a sealing gasket 107 and a fastening knob 109; a cylindrical dust container 106 with a radius of 3 cm and a height of 1.5 cm is placed on the upper part inside the discharge electrode 103, the bottom of the dust container 106 is made of metal mesh, the interval is 5 microns (the container can be replaced, the mesh holes at the bottom have different sizes), metal dust is placed in the container, a vibrating device with a timer function is installed on the container, and when the container vibrates, the dust falls into plasma. The ultraviolet deuterium lamp 111 is connected with the inner wall of the ionization chamber 1 through a fifth insulating column 112. The ultraviolet deuterium lamp 111 is used as an ultraviolet light source, and other types of ultraviolet light sources can be replaced.

The accelerating cavity 2 and the electron gun neutralizing channel 3 are also cylindrical, the diameters of the electron gun neutralizing channel 3 and the accelerating cavity 2 are smaller than those of the ionization cavity 1, the negative electrode 205 is arranged between the ionization cavity 1 and the accelerating cavity 2 and is in a circular net shape, and the positive electrode 201 is arranged between the accelerating cavity 2 and the electron gun neutralizing channel 3 and is in a circular net shape; the magnetic focusing coil 204 is connected with the outer wall of the accelerating cavity 2 through a second insulating column 203; the deflection electrode 401 is connected to the side of the deflection chamber 4. The ionization chamber 1, the negative electrode 205, the acceleration chamber 2, the magnetic focusing coil 204, the positive electrode 201, the electron gun neutralization channel 3 and the deflecting electric field 401 are arranged on the same central axis and are symmetrical along the central axis.

An air inlet hole 101, an air outlet hole 102 and a first channel 104 are arranged on the ionization cavity 1, the air inlet hole 101 is connected with an air tank 502 of a vacuum system through a pipeline, and an air inlet control valve 501 is arranged between the air inlet hole 101 and the air tank 502 and controls inert gas entering the plasma ionization cavity 1; the vacuum pump 504 is connected to the gas outlet 102 via a pipe to control the pressure of the gas in the chamber. The reticular discharge electrode 103 is a cylindrical cavity, is 0.1m away from the inner wall of the ionization chamber 1 and is insulated, and the thickness of the ionization chamber is about 1 cm; one end of an alternating current power supply 601 is connected with the discharge electrode 103 through a first channel 104, the other end of the alternating current power supply is connected with the resonant inductor 602 and the outer wall of the ionization cavity, the output voltage is 100V-500V, and the output frequency is 10 kHz-50 kHz; the negative electrode 205 is a circular net structure with the diameter of 0.2m and is connected with a negative single pulse power supply 604 through a third channel 202, wherein the amplitude of the negative single pulse power supply is about 50kV, the frequency of the negative single pulse power supply is between 10kHz and 50kHz, and the duty ratio of the negative single pulse power supply is 50 percent; the diameter of the accelerating cavity 2 is 0.2 m; the positive electrode 201 is in a circular net shape, has a diameter of 0.2m, and is grounded through the third channel 202; the strength of the constant magnetic field is 0.5T; the ultraviolet deuterium lamp 111 is connected with the light control power supply 603 through the second channel 110, the ultraviolet deuterium lamp 111 mainly emits ultraviolet light with the wavelength of 190-400nm in an ultraviolet region, and the deflection electrode 401 is connected with a direct current power supply 605 with the amplitude of about 35 kv.

The discharge electrode 103 is supported in an insulating manner as a first insulating column 105, the constant magnetic field 204 is supported in an insulating manner as an insulating rubber column 203, the ultraviolet deuterium lamp 111 is supported in an insulating manner as a fifth insulating column 112, and the deflection electrode 401 is supported in an insulating manner as a fourth insulating column 402. The first insulating columns 105 in the ionization chamber 1 are a plurality of insulating support columns with equal distance, and the first insulating columns 105 in the ionization chamber 1 are distributed at intervals between the discharge electrode 103 and the ionization chamber 1. The acceleration chamber, the electron gun neutralization channel and the deflection chamber are connected by an insulating ring 302.

The process of generating the neutral dust particle flow comprises the following steps: tightening the tightening knob 109 to make the observation window 108 extrude the gasket 107 to seal the cavity; opening the vacuum pump 504 to pump the cavity, and displaying the current pressure in the cavity on the vacuum gauge 503; when the pressure is detected to be 100Pa, an air inlet control valve 501 is opened, and inert gas in the gas tank 502 is filled into the cavity; continuing air extraction, when the air pressure is detected to be 20Pa, giving a trigger signal to a light-control power supply 603, enabling the ultraviolet deuterium lamp 111 to enter a working state, simultaneously turning on an alternating current power supply 601, enabling a capacitance equivalent to the discharge electrode 103 and the inner wall of the cavity and a resonance inductor 602 to form a resonance loop, enabling the alternating current power supply 601 to work at a resonance point of the resonance loop, enabling a high-voltage gap to be formed between the mesh-shaped discharge electrode 103 and the inner wall of the cavity to discharge, simultaneously starting a vibration device in the dust container, enabling free electrons to collide with neutral gas and dust particles under the action of a discharge space electric field to ionize neutral atomic molecules, simultaneously enabling the dust particles to be positively charged under the radiation of an ultraviolet light source, enabling continuous ionization of the gas to cause electron avalanche, and finally breaking down the gas; and the voltage is continuously increased, the self-sustaining and glow discharge of the discharge are realized, and meanwhile, the air is continuously inflated and exhausted, so that the air pressure of the cavity is kept stable. After a period of time, the negative monopulse power supply 604 is turned on, and at this time, the positively charged particles in the ionization chamber 1 are acted by the negative voltage of the negative electrode 205 to flow to the positive electrode 201 and enter the acceleration chamber 2 through the mesh of the negative electrode 205; positively charged particles are accelerated and focused through the accelerating cavity 2 under the combined action of the magnetic fields of the positive electrode 201 and the magnetic focusing coil 204, and enter the neutralizing channel 3 of the electron gun through the meshes of the positive electrode 201; the positively charged particles are neutralized by the electrons, most of the positively charged particles are converted into neutral particles, and a small portion of the charged dust particles are not neutralized; the now mixed dust particle stream enters the deflection chamber 4 and under the constant electric field of the deflection electrode 401, the non-neutralized charged particles are deflected, while only the neutral dust particle stream passes straight through the outlet.

It can be understood that the invention is also provided with a central controller, and the inner core of the central controller can be a single chip microcomputer or a PLC. The outlet at the tail end of the radiation chamber 3 is communicated with other equipment, and the inside of the device for generating and utilizing the neutral particle flow is a sealed environment, so that the pressure and the particle composition can be adjusted through a vacuum system positioned in the ionization chamber 1. These are conventional techniques or conventional choices in the art, are well known to those skilled in the art, and are not important to the improvement of the present technical solution, and will not be described herein for a short time.

The above description is an embodiment of the present invention. The foregoing is a preferred embodiment of the present invention, and the preferred embodiments in each preferred embodiment can be combined and used in any combination if not obviously contradictory or prerequisite to a certain preferred embodiment, and the specific parameters in the examples and the embodiments are only for the purpose of clearly explaining the inventor's invention verification process and are not intended to limit the patent protection scope of the present invention, which is defined by the claims and the equivalent structural changes made by the content of the description of the present invention are also included in the protection scope of the present invention.

Claims

1. A device for generating a stream of neutral airborne particles using ultraviolet radiation and an electron gun, characterized by: the device comprises an ionization chamber (1), an acceleration chamber (2), an electron gun neutralization channel (3) and a deflection chamber (4) which are sequentially communicated end to end, wherein the ionization chamber (1), the acceleration chamber (2), the electron gun neutralization channel (3) and the deflection chamber (4) are all in a flat cylindrical shape with two open ends, the device also comprises a vacuum system communicated with a pipeline of the ionization chamber (1) and an electric power system for providing electric energy for the ionization chamber (1), the acceleration chamber (2), the electron gun neutralization channel (3) and the deflection chamber (4);

be equipped with ionization subassembly and radiation module in ionization chamber (1), chamber (2) are equipped with higher speed the subassembly with higher speed, the side intercommunication of electron gun neutralization channel (3) is provided with electron gun body (301), it is equipped with the deflection subassembly to deflect chamber (4) lateral wall, with higher speed the tail end of chamber (2) with between the head end of electron gun neutralization channel (3) the tail end of electron gun neutralization channel (3) with be equipped with insulating ring (302) between the head end of deflection chamber (4) respectively.

2. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as recited in claim 1, wherein: the ionization assembly comprises a reticular discharge electrode (103) concentrically arranged in the ionization chamber (1), a plurality of first insulating columns (105) which are connected with the outer side surface of the reticular discharge electrode (103) and the inner wall of the ionization chamber (1) are sequentially arranged between the outer side surface of the reticular discharge electrode (103) and the inner wall of the ionization chamber (1), a dust container (106) which can be controlled to release dust is arranged at the upper part of the space enclosed by the reticular discharge electrode (103), and an observation window (108) is arranged at the head port of the ionization chamber (1).

3. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as claimed in claim 2, wherein: the dust container (106) is vertically arranged in a cylindrical shape, the bottom surface of the dust container (106) is in a mesh structure, and the top or the side wall of the dust container (106) is provided with a vibration mechanism which can be controlled to open and close.

4. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as claimed in claim 2, wherein: the observation window (108) is fixed at the position of the head port of the ionization chamber (1) through a detachable fastening knob (109), and a sealing gasket (107) is arranged between the observation window (108) and the head port of the ionization chamber (1).

5. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as recited in claim 1, wherein: the vacuum system comprises a gas tank (502), the output end of the gas tank (502) is communicated with a gas inlet hole (101) formed in the side wall of the ionization chamber (1) through a gas inlet pipeline, and a control valve (501) is arranged on the gas inlet pipeline; the vacuum system further comprises a vacuum pump (504), the input end of the vacuum pump (504) is communicated with an air outlet hole (102) formed in the side wall of the ionization cavity (1) through an air outlet pipeline, and a control valve (501) is arranged on the air outlet pipeline.

6. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as claimed in claim 2, wherein: the accelerating assembly comprises a mesh negative electrode (205) arranged between a head port of the accelerating cavity (2) and a tail port of the ionization cavity (1) and a mesh positive electrode (201) arranged between the tail port of the accelerating cavity (2) and a head port of the electron gun neutralizing channel (3), and a magnetic focusing coil (204) is concentrically arranged on the outer side wall of the accelerating cavity (2); the magnetic focusing coil (204) is connected with the accelerating cavity (2) through a plurality of second insulating columns (203) which are distributed on the outer side wall of the accelerating cavity (2) in sequence, and a constant magnetic field is formed in the accelerating cavity (2).

7. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as recited in claim 1, wherein: the deflection assembly comprises a deflection electrode (401) concentrically arranged on the outer side wall of the deflection cavity (4), the deflection electrode (401) is connected with the deflection cavity (4) through a plurality of fourth insulating columns (402) distributed on the outer side wall of the deflection cavity (4) in order, and a deflection electric field is formed in the deflection cavity (4).

8. The apparatus for generating a stream of neutral dust particles using ultraviolet radiation and an electron gun as recited in claim 1, wherein: the inner diameters of the electron gun neutralization channel (3) and the accelerating cavity (2) are smaller than the inner diameter of the ionization cavity (1).